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Edit File : index.js \| Size : 1.69 KB
const cache = new Map() const fs = require('fs') const { dirname, resolve } = require('path') const lstat = path => new Promise((res, rej) => fs.lstat(path, (er, st) => er ? rej(er) : res(st))) const inferOwner = path => { path = resolve(path) if (cache.has(path)) return Promise.resolve(cache.get(path)) const statThen = st => { const { uid, gid } = st cache.set(path, { uid, gid }) return { uid, gid } } const parent = dirname(path) const parentTrap = parent === path ? null : er => { return inferOwner(parent).then((owner) => { cache.set(path, owner) return owner }) } return lstat(path).then(statThen, parentTrap) } const inferOwnerSync = path => { path = resolve(path) if (cache.has(path)) return cache.get(path) const parent = dirname(path) // avoid obscuring call site by re-throwing // "catch" the error by returning from a finally, // only if we're not at the root, and the parent call works. let threw = true try { const st = fs.lstatSync(path) threw = false const { uid, gid } = st cache.set(path, { uid, gid }) return { uid, gid } } finally { if (threw && parent !== path) { const owner = inferOwnerSync(parent) cache.set(path, owner) return owner // eslint-disable-line no-unsafe-finally } } } const inflight = new Map() module.exports = path => { path = resolve(path) if (inflight.has(path)) return Promise.resolve(inflight.get(path)) const p = inferOwner(path).then(owner => { inflight.delete(path) return owner }) inflight.set(path, p) return p } module.exports.sync = inferOwnerSync module.exports.clearCache = () => { cache.clear() inflight.clear() } Back

Edit File : index.js | Size : 1.69 KB

const cache = new Map()
const fs = require('fs')
const { dirname, resolve } = require('path')

const lstat = path => new Promise((res, rej) =>
  fs.lstat(path, (er, st) => er ? rej(er) : res(st)))

const inferOwner = path => {
  path = resolve(path)
  if (cache.has(path))
    return Promise.resolve(cache.get(path))

const statThen = st => {
    const { uid, gid } = st
    cache.set(path, { uid, gid })
    return { uid, gid }
  }
  const parent = dirname(path)
  const parentTrap = parent === path ? null : er => {
    return inferOwner(parent).then((owner) => {
      cache.set(path, owner)
      return owner
    })
  }
  return lstat(path).then(statThen, parentTrap)
}

const inferOwnerSync = path => {
  path = resolve(path)
  if (cache.has(path))
    return cache.get(path)

const parent = dirname(path)

// avoid obscuring call site by re-throwing
  // "catch" the error by returning from a finally,
  // only if we're not at the root, and the parent call works.
  let threw = true
  try {
    const st = fs.lstatSync(path)
    threw = false
    const { uid, gid } = st
    cache.set(path, { uid, gid })
    return { uid, gid }
  } finally {
    if (threw && parent !== path) {
      const owner = inferOwnerSync(parent)
      cache.set(path, owner)
      return owner // eslint-disable-line no-unsafe-finally
    }
  }
}

const inflight = new Map()
module.exports = path => {
  path = resolve(path)
  if (inflight.has(path))
    return Promise.resolve(inflight.get(path))
  const p = inferOwner(path).then(owner => {
    inflight.delete(path)
    return owner
  })
  inflight.set(path, p)
  return p
}
module.exports.sync = inferOwnerSync
module.exports.clearCache = () => {
  cache.clear()
  inflight.clear()
}

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